Einstein believed that gravity is not a force but the curvature of space-time. Matter tells space how to bend, and space tells matter how to move.
Spacetime is a concept without mass and physical existence. What is its curvature? Space has no mass and no force, so how can it tell matter how to move? How to calculate gravity using the curvature of space-time? Without power, how can matter move?
He was the godfather of quantum mechanics and received a Nobel Prize for his theory of the photoelectric effect. Before his death, however, he quoted:
All these fifty years of conscious brooding have brought me no nearer to the answer to the question, 'What are light quanta?' Nowadays every Tom, D i c k and Harry thinks he knows it, but he is mistaken.
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